Drum for cable railways



(No Model.)

J-. WALKER. DRUM FOR CABLE RAILWAYS.

No. 414,958. Patented Nov. 12, 1889.

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JOHN WALKER, or CLEVELAND, OHIO.

DRUM FOR CABLE RAILWAYS.

SPECIFICATION forming part of Letters Patent No. 414,958, dated November 12, 1889.

Application filed August 16, 1889. Serial No. 321,008. (No model.)

To all wham it may concern:

Be it known that 1, JOHN VVALKER, of the city of Oleveland,in the county oi Ouyahoga and State of Ohio, have invented certain Improvements in Drums for Cable Railways, of

which the following is a specification.

This invention, in common with that described in Letters Patent No. 387,024, granted .to me on the 31st day of July, 1888, for cer- IO tain' improvements in drums for cable railways, is to equalize the strain on the cable, and particularly that portion thereof which is wound around the drums; or, in other words, the invention is to prevent the cable beingsubjected to any strain other than that placed thereupon by the cars. In the invention described in the said Letters Patent both drums are alikethat is to say, they are formed with the first of the cable-grooves in a part of the drum which has no independent movement and the others in loosely-turning rings.

In the present invention the drivingdrum has one or more of the grooves in such parts of the drum as do not move independently of the driving-shaft, while the idler-drum has all loosely and independently turning rings.

In the further description of the said invention which follows reference is made to the accompanying drawings, forming a part hereof, and in which Figure. 1 is a side elevation of a pair of drums for a cable railway united by a cable and arranged in'accordance with my inven- 3 5 tion. Fig. 2 is an enlarged cross-section of a portion of the driving-drum, and Fig. 3 a

similar view of the idler. Fig. at illustrates a modification in the construction of the driving-drum, as hereinafter described.

Similar letters of reference indicate similar parts in all the figures.

In the said drawings, A is the driving-drum, and B the idler with which the driving-drum is connected by means of the cable represented by D.

In Fig. 2 the driving-drum is illustrated as having the grooves cast in the rim; but any other manner of arranging the same so that the grooves are in a portion of the drum which has no independent movement circumferentially of the driving-shaft would be the equivalent. In Fig. 4 this drum is shown as having one of the grooved rings secured to the drum proper, the others being loose, after the manner of one of the drums shown and described in the said Letters Patent.

In Fig. 3, which represents the idler-drum, all the grooved rings are loose, and when it is used in connection with adriving-drum with no adjustable rings equalizing of the strain on the cable on the idler-drum only is effected; but when the idler is employed in connection with the driving-drum shown in Fig. 4:, which has only a part of the grooves in adjustable rings, the equalizing movement takes place on both drums.

I claim as my invention- In combination with a driving-drum for a cable railway in which one or more of the grooves for the cable are in a portion which moves in unison with the driving-shaft, an idler-drum having all the grooves for the cable in rings adapted to turn independently of the drum proper or the idler-shaft, substan: tially as and for the purpose specified.

JOHN IVALKER.

\Vitnesses:

J. J. BEVER, Z. M. I'IUBBELL. 

